if your looking for polished surfaces (front and back), the best flatness that I
have seen is from Ultrasil Corporation in Hayward where they can supply 4"
wafers
at 0.6-0.9 um TTV and <1 um on 150mm wafers with Double Side Polishing.
Dont know of anything better- Should you find some , let me know as well.
Ken
Justin Mansell wrote:
> Can someone recommend a silicon wafer vendor for very flat wafers? I'm
> looking ideally for less than a wave at 633nm over the entire wafer.
> Justin Mansell | "Only a risk tests the reality of a belief"
> Ginzton Laboratory | - C. S. Lewis
> 445 Via Palou St. |
> Stanford, CA 94305 | (650) 723-2666 (fax) (650) 725-2284
(office)
>